Name: Construction of Angles Using Protractor
Uploaded: 2019-07-19
Duration: 4 min 7 s
Description: We know that an angle is formed when two rays join at a common point. In this video session, learn how to construct angles using a basic geometry tool called a protractor.

Question

Draw an angle of measure

140 ˚

. Divide it into four equal parts using a ruler and compasses.

Accepted Answer

Steps of construction-

Step $1$ : Draw a line $\vec{OA}$ .

Step $2$ : Take the point $A$ as the centre and make an angle $∠ BOA$ of measure $140 ˚$ by using a protractor.

Step $3$ : Take a suitable radius draw an arc with point $O$ as the centre to cut $\vec{OB}$ as well as $\vec{OA}$ .

Step $4$ : Bisect $∠ BOA$ at $D$ . Join points $O$ and $D$ to form $∠ BOD and ∠ AOD$ each of $70 ˚$ .

Step $5$ : Bisect $∠ BOD$ at $C$ . Join points $O and C$ to form $∠ BOC$ and $∠ COD$ of $35 ˚$ each.

Step $6$ : Bisect $∠ AOD$ at $E$ . Join points $O$ and $E$ to form $∠ DOE$ and $∠ EOA$ of $35 ˚$ each.

Thus, an angle of $140 ˚$ has been divided into $4$ equal parts.

Draw an angle of measure $140 ˚$ . Divide it into four equal parts using a ruler and compasses.

Important Questions on Practical Geometry

Learn and Prepare for any exam you want !

Draw an angle of measure 140˚. Divide it into four equal parts using a ruler and compasses.

Important Questions on Practical Geometry

Learn and Prepare for any exam you want !

Draw an angle of measure $140 ˚$ . Divide it into four equal parts using a ruler and compasses.